#!/bin/sh
#
# An example hook script to check the commit log message.
# Called by git-commit with one argument, the name of the file
# that has the commit message.  The hook should exit with non-zero
# status after issuing an appropriate message if it wants to stop the
# commit.  The hook is allowed to edit the commit message file.
#
# To enable this hook, make this file executable.

# Uncomment the below to add a Signed-off-by line to the message.
# SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
# grep -qs "^$SOB" "$1" || echo "$SOB" >> "$1"

# This example catches duplicate Signed-off-by lines.

base_dir=$(dirname $0)
MSG="$1"

abort() {
    cp $1 $1.save
    cat >&2 <<EOF
Commit aborted, your commit message was saved as '$1.save'.

Reason: $2

EOF
    exit 1
}

test "" = "$(grep '^Signed-off-by: ' "$1" |
	 sort | uniq -c | sed -e '/^[ 	]*1[ 	]/d')" || {
	abort "$1" "Duplicate Signed-off-by lines."
}

# Check that the first line exists, and is not an asterisk

if [ -z "`head -n 1 $1 | grep -v '^[[:blank:]]*\*$'`" ] ; then
    abort "$1" "Please provide the general description on the first line."
fi

# ...and that it is not too long

if [ "`head -n 1 $1 | wc -c`" -gt 79 ] ; then
    abort "$1" "The first line is too long, please try to fit into 79 characters."
fi

# ...and that it does not continue on the second line
if [ "`wc -l < $1`" -gt 1 -a -n "`head -n 2 $1 | tail -n 1 | sed 's/^#.*//'`" ] ; then
    abort "$1" "The second line is not empty - maybe the first line continues there?"
fi

# Check that the message is not a ChangeLog-like one

if [ -n "`head -n 1 $1 | grep '^[0-9]\{4\}-[0-9]\{2\}-[0-9]\{2\}.*<.*@.*>'`" ] ; then
    abort "$1" "The commit message looks like ChangeLog, please use the git form."
fi

# Check for whitespace in front of *'s

if [ -n "`sed '/^#/,$d' $1 | grep '^[[:space:]]\+\*.*:'`" -a -z "`grep '^\*' $1`" ] ; then
    abort "$1" "Please don't use whitespace in front of '* file: Description.' entries."
fi

# Check that lines do not start with '#<something>' (possibly accidental commit,
# such as starting the message with '#ifdef', git commits start with '#<whitespace>'.

if [ -n "`grep '^#[^[:blank:]]' $1`" ] ; then
    abort "$1" "Possible accidental comment in the commit message (leading # without space)."
fi


#------------------ copied gerrit commit-msg hook to handle ChangeId -->
# From Gerrit Code Review 2.3
#
# Part of Gerrit Code Review (http://code.google.com/p/gerrit/)
#
# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

CHANGE_ID_AFTER="Bug|Issue"

# Check for, and add if missing, a unique Change-Id
#
add_ChangeId() {
        clean_message=`sed -e '
                /^diff --git a\/.*/{
                        s///
                        q
                }
                /^Signed-off-by:/d
                /^#/d
        ' "$MSG" | git stripspace`
        if test -z "$clean_message"
        then
                return
        fi

        id=`grep -i '^Change-Id:' "$MSG" | sed -e "s/.*: I//"`
        temp_msg=`grep -v -i '^Change-Id:' "$MSG"`
        echo "$temp_msg" > "$MSG"

        if  test -z "$id"
        then
            id=`_gen_ChangeId`
        fi
        perl -e '
                $MSG = shift;
                $id = shift;
                $CHANGE_ID_AFTER = shift;

                undef $/;
                open(I, $MSG); $_ = <I>; close I;
                s|^diff --git a/.*||ms;
                s|^#.*$||mg;
                exit unless $_;

                @message = split /\n/;
                $haveFooter = 0;
                $startFooter = @message;
                for($line = @message - 1; $line >= 0; $line--) {
                        $_ = $message[$line];

                        if (/^[a-zA-Z0-9-]+: /) {
                                $haveFooter++;
                                next;
                        }
                        next if /^[ []/;
                        $startFooter = $line if ($haveFooter && /^\r?$/);
                        last;
                }

                @footer = @message[$startFooter+1..@message];
                @message = @message[0..$startFooter];
                push(@footer, "") unless @footer;

                for ($line = 0; $line < @footer; $line++) {
                        $_ = $footer[$line];
                        next if /^($CHANGE_ID_AFTER):/i;
                        last;
                }
                splice(@footer, $line, 0, "Change-Id: I$id");

                $_ = join("\n", @message, @footer);
                open(O, ">$MSG"); print O; close O;
        ' "$MSG" "$id" "$CHANGE_ID_AFTER"
}
_gen_ChangeIdInput() {
        echo "tree `git write-tree`"
        if parent=`git rev-parse HEAD^0 2>/dev/null`
        then
                echo "parent $parent"
        fi
        echo "author `git var GIT_AUTHOR_IDENT`"
        echo "committer `git var GIT_COMMITTER_IDENT`"
        echo
        printf '%s' "$clean_message"
}
_gen_ChangeId() {
        _gen_ChangeIdInput |
        git hash-object -t commit --stdin
}


add_ChangeId
#------------------ copied gerrit commit-msg hook to handle ChangeId <--


exit 0
